Condensed Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ 72,234	$ 67,090	$ 130,373	$ (83,083)
Pension and post-retirement plan adjustments, net of tax	2,022	115	2,396	554
Reclassification from accumulated other comprehensive loss into net income (loss)(b)	(1,200)	0	(1,200)	0
Preferred dividends	(10)	(10)	(20)	(20)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,183,091	990,129	1,143,442	1,158,347
Net loss	72,234	67,090	130,373	(83,083)
Common dividends	(20,089)	(18,459)	(38,569)	(36,494)
Preferred dividends	(10)	(10)	(20)	(20)
Ending balance	1,235,226	1,038,750	1,235,226	1,038,750
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(139,548)	(147,082)	(129,249)	(158,717)
Foreign currency translation adjustments	(8,822)	5,039	(19,495)	16,233
Pension and post-retirement plan adjustments, net of tax	2,022	115	2,396	554
Unrealized net gains (losses) on available-for-sale securities				2
Reclassification from accumulated other comprehensive loss into net income (loss)(b)	(1,200)		(1,200)
Ending balance	$ (147,548)	$ (141,928)	$ (147,548)	$ (141,928)